eventid

Monotonically increasing per machine, globally unique eventids

Note: This is not an official Google product.

An eventId uniquely identifies an event across a network of services. It is globally unique, and is monotically increasing locally. This makes eventids useful for lexically comparable identifiers for events in a distributed system.

This can be used instead of timestamps – JavaScript timestamps only have millisecond resolution making them unsuitable for the purpose of building monotonically increasing local ids.

const EventId = require('eventid');

// Instantiate a generator.
const eventId = new EventId();

// Generate a globally unique identifier.
const id1 = eventId.new(); // -> "..........37qqNkj4K24ulWyeuWxpZh"
// Use the same generator to get monotonically increasing local ids.
const id2 = eventId.new(); // -> "..........77qqNkj4K24ulWyeuWxpZh"
// You can lexicographically compare the ids.
assert(id1 < id2); // -> true

// Another instance will use a different guid
const another = new EventId();
const id3 = another.new(); // -> "..........5rkLYOc5W8ZAHAmVSyrixJ"

Changelog

1.0.0 (2019-11-05)

⚠ BREAKING CHANGES

• Stop supporting Node 6 as it reaches EOL.
• drop support for node.js 4.x and 9.x (#25)

Features

• convert to TypeScript (#24) (18b8d24)

Build System

• drop support for Node 6 (#41) (41409f4)

Miscellaneous Chores

• drop support for node.js 4.x and 9.x (#25) (f69a1b0)